ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2022, Vol. 43 ›› Issue (1): 62-65.

• 工艺技术 • 上一篇    下一篇

Als、N 和过热度对 Φ50~60 mm 40Mn2 钢裂纹影响分析和改进工艺

郭志强   

  1. 河南凤宝特钢有限公司技术中心,林州 456500
  • 收稿日期:2021-05-26 出版日期:2022-01-25 发布日期:2022-03-18
  • 作者简介:郭志强(1973-),男,硕士,(2013 年北京科技大学),高级工程师,1997年内蒙古科技大学(本科)毕业,炼钢技术与产品质量管理。

Analysis on Effect of Als、N and Superheat on 40Mn2 Steel Φ50 ~60 mm Bar Crack and Technology Improvement

Guo Zhiqiang   

  1. Technology Center,Henan Feng Bao Special Steel Co Ltd,Linzhou 456500
  • Received:2021-05-26 Published:2022-01-25 Online:2022-03-18

摘要: 通过使用ARL8820直读光谱仪,LECO氧氮氢气体分析仪和铂铑热电偶等方法,研究了40Mn2圆钢中的Als、N和连铸钢液过热度对钢材裂纹的影响。结果表明:Als、N和连铸钢液的过热度分别为0.021%~0.035%,0.0065%~0.0083%和32~46℃的炉次Φ50~60 mm轧材表面出现了裂纹。工艺改进后,控制钢中的Als 0.015%~0.025%,[N]≤0.0060%,连铸钢液过热度18~30℃,连铸坯表面未出现裂纹,保证了轧材表面质量。

关键词: 40Mn2 钢, Als, N, 过热度, 钢材裂纹

Abstract: The effect of Als、N in 40Mn2 round steel and superheat of molten steel on the steel bar crack is studied by using ARL8820 Direct-reading spectrometer, LECO oxygen-nitrogen-hydrogen gas analyzer, platinum rhodium thermocouple etc. The results show that of heats respectively with 0.021% ~ 0.035% Als, 0. 0065% ~ 0. 0083% N and cast liquid superheat 32 ~ 46 ℃ the Φ50 ~60 mm rolled bar surface occurs crack. After technology improvement, with controlling 0. 015% ~ 0. 025% Als, ≤0. 0060%[ N ] and the superheat of molten steel 18 ~30 ℃,the cracks on the surface of continuous casting billet non-occur and the surface quality of the products is guaranteed.